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VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Chemistry => Topic started by: lisafaustina on September 10, 2010, 04:45:43 pm

Title: galvanic cells and electrolysis
Post by: lisafaustina on September 10, 2010, 04:45:43 pm

 if the anode is placed higher than the cathode in the electrochemical series, does a reaction still occur?

Title: Re: galvanic cells and electrolysis
Post by: cypriottiger on September 10, 2010, 05:31:37 pm

in a regular reaction. no, as a positive gradient occurs (the actual scientific reason why i have forgotten :S)

Title: Re: galvanic cells and electrolysis
Post by: kenhung123 on September 10, 2010, 06:53:19 pm

In electrolysis yes.

Title: Re: galvanic cells and electrolysis
Post by: andy456 on September 10, 2010, 10:58:53 pm

It only occurs with the imput of electrical energy; that is it will happen, just not spontaneously (I think)

Title: Re: galvanic cells and electrolysis
Post by: Richiie on September 10, 2010, 11:09:41 pm

Quote from: cypriottiger on September 10, 2010, 05:31:37 pm

in a regular reaction. no, as a positive gradient occurs (the actual scientific reason why i have forgotten :S)

Using this method isn't really helpful. Just, the electrons donated from the reductant wouldn't want to go to an oxidant which has a lower e naught value.

Title: Re: galvanic cells and electrolysis
Post by: sajib_mostofa on September 11, 2010, 08:55:34 pm

Just a quick note, you have to be aware that even if the cathode is higher than the anode and the reaction occurs in theory, practically it may not occur due to requirements such as catalyst or certain temperature, which the electrochemical series does not take into consideration.